On Mon, Nov 18, 2013 at 10:35 AM, Paul B. Huter <[email protected]> wrote: > If I want to use a low-pass filter to look at 1MHz blocks of data, is it > appropriate to use the following parameters: > > low pass filter: 500khz > center frequency: -500khz (for 1MHz, increments of 1MHz for others) > Taps: firdes.low_pass(1, samp_rate, 500000, 100) > > Paul B. Huter
For a low pass filter, you specify the passband bandwidth, but it's a real-valued filter, so it's symmetric about 0. So, yes, if you set the bandwidth of the filter to 500 kHz, then the filter will filter from -500 to +500 kHz. If you just want to look at 1 MHz of spectrum, I suggest you also decimate the incoming signal so that you reduce your processing requirements as well as filter. Tom _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
